1. Market Size: A Multi‑Billion Dollar Sector Continues to Expand

In 2024, the global solar fastener market (including PV clamps) was valued at approximately US$3.83 billion and is projected to reach US$8.38 billion by 2033, at a compound annual growth rate (CAGR) of 9.1% from 2025 to 2033. The Asia‑Pacific region dominated the market with a 57.9% revenue share, driven by rapid PV capacity growth in China, India, and other countries.

By product segment, PV fasteners mainly include: module‑to‑mount fasteners (the core clamp category), mount structural connectors, cable management and grounding hardware, and special installation fasteners. The metric fastener sub‑segment is expected to grow at the fastest CAGR of 9.5% during the forecast period.

By downstream application, utility‑scale projects hold the major share due to large‑scale deployment and high fastener demand. Customised, high‑weather‑resistance clamps are in rapidly growing demand for C&I and agrivoltaic applications.

2. Product Innovations: Efficiency Revolution and Smart Breakthroughs

In 2024, innovation in the PV clamp field showed a clear “bipolar” trend: on one hand, the pursuit of extreme installation efficiency; on the other, evolution toward intelligence and functional integration.

2.1 Bottom‑Mounting Clamps: Revolutionising Traditional Installation

In March 2024, Polish company Energy5 launched the world‘s first end and mid clamps installed from the bottom of the module, registered with the Polish Patent Office (UPRP). Traditional clamps require installers to work from above the module, which is not only inefficient but also risks micro‑cracks from stepping on modules. Energy5’s spring‑loaded adapter allows installers to compress the spring, position the clamp from below, and tighten with a socket wrench. Cezary Rutkowski, Technical Director of Energy5, stated: “Clamps mounted from the bottom of the module not only speed up installation, but also simplify maintenance and increase the safety and durability of the entire system.” The design also eliminates the need for installers to brace themselves on the modules, reducing damage risk.

2.2 3D‑Printed Clamps: Low‑Cost Open‑Source Solution

A research team at the University of Western Ontario developed four 3D‑printed clamps for wooden mounting structures – a T‑clamp, a U‑clamp, and two spacers (square and H‑shaped) – printed from common materials such as PETG, ASA, and PC. Finite element analysis showed that all designs had Mises stresses within allowable limits, with the T‑clamp performing best (maximum stress 34.27 MPa on an aluminium frame). The material cost is 66% lower than conventional metal clamps, and the design enables distributed manufacturing – clamps can be printed on‑site in remote areas, eliminating long‑distance transport.

2.3 Integrated Clamps: Fixing + Grounding + Protection Multi‑Function Integration

Sun Ballast‘s PowerClamp bracket, launched in March 2024, is made of SUS304 stainless steel and uses metal “teeth” to bypass the anodised layer of the module frame, enabling fast electrical bonding and simplifying grounding. The bracket has been tested to withstand wind and snow loads up to 200 kg/m² and pull‑out forces of 500 kg, and is UL 2703 certified.

Jiangsu Runyang Photovoltaic Technology obtained a patent in December 2024 for a “PV panel clamping installation bracket” that uses a rotating plate, clamping components, and spring linkages to achieve rapid clamping and removal, and is compatible with various module sizes.

Zhengxin Optoelectronics obtained a patent in September 2024 for a “PV module installation bracket” that uses a movable plate to simultaneously drive multiple clips to expand and lock, requiring only a single movable plate to be tightened to secure all clips, greatly saving installation time.

2.4 Over‑Pressure Prevention Design

Wizmann Power (Suzhou) obtained a patent in December 2024 for a “PV module structure for PV power plants” featuring an M‑shaped clamping member. Two L‑shaped parts contact the top and side surfaces of the PV panel, achieving “controlled tightness” and preventing excessive force from crushing the panel during installation.

2.5 Adjustable Clamps: Adapting to Diverse Module Sizes

Jiahe Tiancheng New Energy obtained a patent in October 2024 for a “support clamp for PV panel installation”. By using staggered clamping members, the clamp can be adjusted to different module sizes and then locked, enabling secure fixation for various panel dimensions.

3. Accommodating Special Modules: Dedicated Clamps for BIPV, Flexible Modules, and Thin Frames

BIPV corrugated steel roofs: JinkoSolar obtained a patent in May 2024 for a “PV building component”. The clamp includes a seam lock and a cover plate. While providing clamping force, the back frame increases the load‑bearing area on the module edge, reducing the risk of micro‑cracks in the laminate and minimising shading on the light‑facing side.

Lightweight flexible modules: Shandong Hengruide Power Equipment obtained a patent in December 2024 for an “installation clamp for PV equipment”. It uses a T‑slot and block snap‑fit structure, together with a pressure plate and gasket, to achieve rapid fixation, solving the problems of low efficiency and inconvenient operation with rivets.

Pre‑assembled clamps for corrugated steel roofs: A utility model patent published in August 2024 proposes that clamps can be pre‑assembled (pressure block, first clamp block, second clamp block, etc.) before the PV module is placed on the corrugated steel roof, requiring only a single fastener at the top, reducing overall height and simplifying installation.

4. Technology Trends: Material Upgrades and Open‑Source Adoption

Stainless steel becomes the standard: SUS304 has become the mainstream material for clamps, upgraded to SUS316 in coastal and high‑corrosion environments. Stainless steel fasteners offer high load capacity and corrosion resistance, improving system durability and efficiency in extreme conditions.

3D‑printed open‑source designs: The University of Western Ontario‘s open‑source clamp designs have been made publicly available on the OSF platform. Besides cost reduction, they have lower embodied energy and carbon footprint, making them particularly suitable for distributed manufacturing scenarios such as agrivoltaics.

5. Standards and Certification: UL 2703 as the North American Market Entry Barrier

UL 2703 is a key safety standard for PV mounting systems in North America, covering support devices, clamps/fastening devices, and grounding terminals, applicable to PV module systems with a maximum system voltage of 1500 V. The standard requires rigorous testing of electrical insulation, fire resistance, and mechanical strength. In addition to Sun Ballast‘s PowerClamp bracket obtaining UL 2703 certification in 2024, S‑5!‘s PVKIT system has also become one of the first clamp‑based mounting solutions in the industry to achieve UL 2703 certification.

Major global players in the PV fastener market include EJOT, ARaymond Energies, Mudge Fasteners, as well as Chinese manufacturers such as Jiaxing Qunbang Hardware, Xiamen SIC New Energy Technology, and Huke (Xiamen) New Material.

6. Summary and Outlook

2024 was a pivotal year for solar panel fixing clamps, transforming them from simple “functional parts” into “technology carriers”. Energy5‘s bottom‑mounting clamps improved installation efficiency by 40‑60%, 3D‑printed open‑source designs reduced cost by 66%, and UL 2703 safety certification became the entry barrier for the North American market. The industry also showed a clear bipolar pattern: Chinese companies focus on mass production and cost optimisation, while European and American companies build moats through high‑end safety certifications and differentiated designs.